ZCZC FA48 211200 UTC OF JULY FINNISH NAV WARN 372/26 NORTHERN BALTIC UNDERWATER DIVING OPERATIONS IN PROGRESS BY SEVERAL WORKING VESSELS IN VICINITY OF 59-26.0N 021-04.5E. SEVERAL MARKER BUOYS ARE ANCHORED IN THE AREA. MARINERS ARE REQUESTED TO KEEP SHARP LOOKOUT AND MINIMUM DISTANCE OF 1.4 NM FROM THE AREA. NNNN